Function:

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Bipolar linear regulated power supplies consist of two intermediate circuits, one for each polarity. The mains voltage is transformed to the appropriate level and rectified. The rectified voltage charges a bank of capacitors of the intermediate circuit to a constant voltage, which it is given via a set of power transistors to the output. The output stages of the positive and the negative circuit are switched together in a push-pull manner. The regulation transistors define the final stability of the output voltage and the regulation speed. Bipolar power supplies are possible to operate as a kind of 4 quadrant power amplifier. (optionally also for active loads).

Design:

• 19" table-top case (19" rack adaptors available)
• Cooling: Convection or built-in fan with air outlet on the rear

Output:

• Output isolation:
  The output is floating. Operating voltage with respect to earth: max. ±500 V. One of the output terminals may be connected to earth.
• Output terminals:
  4 mm safety connectors up to 20 A on the front panel. For higher currents clamps installed on the rear

Technical Data:

• Mains connection:
  

  up to 1400W nominal power:	230 V ±10% 47 Hz to 63 Hz
  for 2800W and higher:	400 V ±10% 47 Hz to 63 Hz, three-phase

• Ambient temperature: 0°C to +40°C

• Power loss: at nominal load approx. 35%, during short circuit at nominal current approx 140% and at no load approx. 15% of the nominal power.

• The following data applies for voltage and current regulation, and refers to the rated value (if not stated otherwise):
  (For explanations please refer to the Terms & Definitions page.)

  Setting range:	from -100% to +100%
  Reproducibility:	±2 x 10-4
  Setting resolution (potentiometer):	±2 x 10-3
  Residual ripple:	<5 x 10-4pp + 10 mVpp
  Recovery time:	<50 µs for load changes from 10% to 100% or from 100% to 10%
  Setting time at nominal load:	<1 ms for full range
  Deviation:  for ±10% mains voltage variation: for no load / full load: over 8 h under constant conditions: within the temperature range:	<± 2 x 10-5 <2 x 10-4 <±2 x 10-4 <±2 x 10-4 / K

Possible Options:

• Analogue programming
• Analogue programming, floating 
• DVM with higher resolution
• Computer interface - IEEE 488, RS 232, RS 422, USB, LAN (Ethernet), Profibus DP (more on request)
• Full 4-quadrant operation, even with active loads
• Higher programming speed

More options and special solutions on request. Some options may involve changes to the description of the unit - especially concerning the mechanical design.

NLB Standard Types:

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For prices please ask us or one of our representatives.

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Bipolar HV power supplies consist of 2 switch-mode controlled HV sources which are connected to the output. In principle, the rectified line voltage in each source drives a square wave generator of fixed frequency, whose AC voltage is transformed, rectified and filtered, producing the positive or negative output voltage. For regulation, the square wave voltage is pulse width modulated. The operation is contra-moving, and the output can be adjusted with continuous zero crossing.

Design:

• 19" table-top case (19" rack adaptors available)

Output:

• Output isolation:
  One output terminal each leads the high voltage, the  "0V" terminal is connected firmly to earth. If required, the "0V" terminal can be made floating against earth up to ± 300V.
• Output terminals:
  All output terminals are located at the front plate of the unit. High voltage connectors with the appropriate dielectric strength are delivered with the power supply.

Technical Data:

• Mains connection: 230 V ±10% 47 Hz to 63 Hz

• Ambient temperature: 0°C to +40°C

• The following data applies for voltage and current regulation, and refers to the rated value (if not stated otherwise):
  (For explanations please refer to the Terms & Definitions page.)

  Setting range:	from -100% to +100%
  Reproducibility:	±1 x 10-4
  Setting resolution (potentiometer):	±1 x 10-3
  Residual ripple:	<3 x 10-4pp + 50 mVpp, typ. 2 x 10-4pp
  Recovery time for voltage control:	<1 ms for load changes from 10% to 100% or from 100% to 10%
  Setting time at nominal load:	<200ms for changes of the output voltage from 10% to 90% or 90% to 10%
  Deviation:  for ±10% mains voltage variation: for no load / full load: over 8 h under constant conditions: within the temperature range:	<± 2 x 10-5 <2 x 10-4 <±2 x 10-4 <±2 x 10-4 / K

Possible Options:

• Analogue programming
• Analogue programming, floating 
• DVM with higher resolution
• Computer interface - IEEE 488, RS 232, RS 422, USB, LAN (Ethernet), Profibus DP (more on request)
• Lower ripple
• Higher stability
• Lower stored energy and shorter setting time

More options and special solutions on request. Some options may involve changes to the description of the unit - especially concerning the mechanical design.

HCB Standard Types:

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For prices please ask us or one of our representatives.